If f(x) = 3x2 - 2x + 5, find f(-2)
a) -27
b) -11
c) -3
d) 21

D

Step-by-step explanation:

You have to be careful that you treat 21 as special. It is the only positive number. As you do the problem, keep an eye on 21.

f(-2) = 3x^2 - 2x + 5                Put -2 wherever you see an x

f(-2) = 3(-2)^2 - 2(-2) + 5         Calculate the first term.    

f(-2) = 3(4) - 2(-2) + 5              Remove the brackets of the second term

f(-2) = 12 + 4 + 5                     Combine

f(-2) = 21

see explanation

step-by-step explanation:

since the sequence is geometric there is a common ratio r between consecutive terms, that is

r = 4 ÷ - 2 = - 2

r = - 8 ÷ 4 = - 2

r = 16 ÷ 8 = - 2

the next term - 13 must be incorrect as it should be - 32 for the sequence to be geometric.

the first 4 terms are therefore geometric with common ratio r = - 2

what? ?

what type of question is thiss

step-by-step explanation: